Air sealing system of alkali liquor incinerator and fused salt self-sealing type discharging method

Abstract

The invention discloses an air sealing system of an alkali liquor incinerator and a fused salt self-sealing type discharging method.The sealing system comprises a molten pool which is in a hopper shape and arranged at the bottom of a hearth, a discharging outer pipe, a discharging inner pipe, a gas inlet pipe, a gas outlet pipe, a gas inlet pipe, a gas outlet pipe and a gas outlet pipe, the collecting end is connected with a molten pool, the releasing end is vertically inserted into the discharging outer pipe, the self-sealing pipe is located in the discharging outer pipe, one end of the self-sealing pipe is of a closed structure, the other end of the self-sealing pipe is arranged on the releasing end of the discharging inner pipe in a sleeved mode in a clearance mode, the heating module is arranged in the discharging outer pipe and used for heating the self-sealing pipe, and the air isolation valve is arranged at the exposed end of the discharging outer pipe. According to the sealing system, sealing of molten salt discharging is achieved through innovation of a discharging structure, and it is guaranteed that external air is difficult to enter the incinerator through the structural characteristics of the self-sealing pipe and the air isolation valve.

Description

Technical Field

[0001] The invention belongs to the technical field of waste gas and waste liquid treatment, and more specifically, relates to an air sealing system of an alkali liquid incinerator and a molten salt self-sealing discharge method. Background Art

[0002] A large amount of high-concentration alkaline waste gas and waste liquid will be generated in the petrochemical, papermaking, printing and other industries. This part of waste gas and waste liquid is highly alkaline and contains high concentrations of sulfides and organic matter. If it is directly discharged, it will cause serious environmental pollution. At present, high-temperature incineration is a widely used method for treating salt-containing waste liquid. High-temperature incineration refers to the process of decomposing and harmlessly treating organic matter in incinerated waste. The incineration process consists of gasification, thermal decomposition, and combustion heat transfer processes. According to the requirements of GB18484, the waste to be incinerated is generally incinerated at 1100°C for more than 2s to generate CO2 and H2O from organic hydrocarbons, and the residual salt is discharged in a molten state. The solid particles in the flue gas are collected and packaged in the subsequent process flow.

[0003] At present, the common incinerators are mainly integrated incinerators and quench incinerators. Among them, the integrated incinerator has the advantages of large scale and high thermal efficiency utilization rate. It also conforms to the current development trend of large-scale and green, and has become the most widely used incinerator form. The integrated incinerator is generally composed of a combustion chamber, a cooling chamber and a molten salt recovery device. The waste gas and waste liquid are burned at high temperature in the combustion chamber. A part of the molten salt particles enter the cooling chamber with the flue gas, and the other part of the molten salt particles gather into molten molten salt. This part of the molten salt has a certain fluidity. Under ideal conditions, it can be recovered and packaged by the molten salt recovery device.

[0004] The general molten salt recovery device consists of a molten salt chute, a water-cooled twin-screw machine or a scraper machine, a baler and other devices. According to the engineering application experience of the waste alkali incinerator, the transportation and baling mechanism outside the incineration boiler operates well, has a long service life, and has no obvious problems. However, the molten salt chute often has blockage problems, causing the incineration boiler to stop frequently. The analysis of the reasons is mainly the following two points. First, because the chute is an open structure and the incinerator is under negative pressure, there is serious air leakage in the chute, which causes the molten salt to cool down and solidify rapidly, and eventually causes the molten salt to be blocked. Second, because the burner in the furnace is far away from the molten salt chute, it is difficult to keep its temperature above the melting point, which eventually leads to the solidification of the molten salt.

[0005] Therefore, it is of great significance to develop a convenient, efficient and continuously operating molten salt discharge method to address the problems arising in the molten salt recovery process. Summary of the invention

[0006] The purpose of the present invention is to solve the problem of frequent blockage of existing molten salt chutes in view of the deficiencies in the prior art.

[0007] In order to achieve the above object, the present invention provides an air sealing system for an alkali liquid incinerator, comprising:

[0008] The molten pool is bucket-shaped and arranged at the bottom of the furnace to form a cavity with the bottom of the furnace;

[0009] An outer discharge pipe, one end of which is located in the cavity at the bottom of the furnace and the other end of which can be exposed outside the furnace;

[0010] An inner discharge pipe is arranged inside the molten pool, a collecting end is connected to the molten pool, and a releasing end is vertically inserted in the outer discharge pipe;

[0011] A self-sealing tube, located inside the discharge outer tube, with one end being a closed structure and the other end being sleeved in a gap on the release end of the discharge inner tube;

[0012] A heating module, disposed in the discharge outer pipe, for heating the self-sealing pipe;

[0013] An air isolation valve is arranged at the exposed end of the discharge outer pipe;

[0014] The molten salt in the alkali liquid incinerator enters the self-sealing tube through the discharge inner tube, and the air isolation valve is opened after the self-sealing tube is overflowed.

[0015] Optionally, the heating module includes an induction heating coil located between the inner periphery of the discharge outer tube and the outer peripheries of the self-sealing tube and the discharge outer tube.

[0016] Optionally, the air isolation valve comprises:

[0017] A fixed shaft, both ends of which are respectively connected to the inner circumference of the discharge outer pipe;

[0018] Two valve leaves, the two valve leaves are rotatably connected to the fixed shaft through a first rotating sleeve and a second rotating sleeve respectively;

[0019] The rebound mechanism is connected to the fixed shaft and the two valve leaves, and can drive the two valve leaves to close the discharge outer pipe.

[0020] Optionally, the valve leaf is semicircular in shape to match the inner circumference of the discharge outer pipe.

[0021] Optionally, the rebound mechanism includes a torsion spring, which is sleeved on the fixed shaft, and two ends of the torsion spring are respectively connected to the two valve leaves.

[0022] Optionally, the furnace also includes a lining and a water-cooled wall.

[0023] Optionally, the cavity is provided with a manhole door communicating with the outside.

[0024] The present invention also provides a molten salt self-sealing discharge method of an alkali liquid incinerator, comprising:

[0025] Utilizing the air sealing system of the above-mentioned alkali liquor incinerator;

[0026] After the molten salt is gathered in the molten pool, it enters the self-sealing tube through the discharge inner tube, so that the molten salt accumulates in the self-sealing tube;

[0027] When the molten salt in the self-sealing tube immerses the discharge inner tube, the discharge inner tube is closed;

[0028] When the molten salt in the self-sealing tube overflows, open the air isolation valve;

[0029] The air isolation valve is closed after the overflowing molten salt is discharged.

[0030] Optionally, it also includes:

[0031] A heating module is arranged between the inner periphery of the discharge outer tube and the outer peripheries of the self-sealing tube and the discharge outer tube;

[0032] The heating module is started according to the temperature of the self-sealing tube to keep the molten salt fluid.

[0033] Optionally, the heating module comprises an induction heating coil.

[0034] The air sealing system of the alkali liquid incinerator of the present invention has the following beneficial effects:

[0035] 1. The sealing system realizes the sealing of molten salt discharge through the innovation of discharge structure. The structural characteristics of self-sealing pipe and air isolation valve ensure that outside air is difficult to enter the incinerator.

[0036] 2. The method of isolating air in the present invention does not have a complicated mechanical structure, so as to reduce the probability of failure.

[0037] 3. The present invention provides an electromagnetic induction heating device during the molten salt discharge process to ensure that the molten salt has good fluidity.

[0038] 4. The waste alkali heating furnace of the present invention has the advantages of continuous operation, high efficiency, and easy maintenance.

[0039] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0041] Figure 1 The schematic diagram of the structure of the alkali liquid incinerator in the prior art is shown.

[0042] Figure 2 A structural schematic diagram of an air sealing system of a alkali liquid incinerator according to an embodiment of the present invention is shown.

[0043] Figure 3 A cross-sectional view of an air sealing system of a alkali liquid incinerator according to an embodiment of the present invention is shown.

[0044] Figure 4 A schematic structural diagram of an air isolation valve of an air sealing system of an alkali liquid incinerator according to an embodiment of the present invention is shown.

[0045] Description of reference numerals:

[0046] 1. Molten pool, 2. Discharge inner pipe, 3. Self-sealing pipe, 4. Discharge outer pipe, 5. Air isolation valve, 6. Lining, 7. Furnace, 8. Induction heating coil, 9. Manhole door;

[0047] 51. valve leaf, 52. fixed shaft, 53. first rotating sleeve, 54. second rotating sleeve, 55. torsion spring. DETAILED DESCRIPTION

[0048] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0049] like Figure 2-4 As shown, an air sealing system for a alkali liquid incinerator comprises:

[0050] The molten pool 1 is bucket-shaped and is disposed at the bottom of the furnace 7 to form a cavity with the bottom of the furnace 7;

[0051] The discharge outer pipe 4 has one end located in the cavity at the bottom of the furnace 7 and the other end exposed to the furnace 7;

[0052] The discharge inner pipe 2 is arranged inside the molten pool 1, the collecting end is connected to the molten pool 1, and the releasing end is vertically inserted into the discharge outer pipe 4;

[0053] The self-sealing tube 3 is located inside the discharge outer tube 4, one end of which is a closed structure, and the other end is sleeved on the release end of the discharge inner tube 2 with a gap;

[0054] A heating module, arranged in the discharge outer pipe 2, for heating the self-sealing pipe 3;

[0055] An air isolation valve 5 is arranged at the exposed end of the discharge outer pipe 4;

[0056] The molten salt in the alkali liquid incinerator enters the self-sealing pipe 3 through the discharge inner pipe 2, and the air isolation valve 5 is opened after the self-sealing pipe 3 overflows.

[0057] Specifically, molten salt is gathered through the molten pool 1, and the molten salt is accumulated through the self-sealing tube 3 to seal the lower end of the discharge inner tube 2 to prevent air from entering the molten pool 1. At the same time, an air isolation valve 5 is provided for secondary sealing to improve the air isolation effect. The air isolation valve 5 can be opened by the gravity of the overflowing molten salt in the self-sealing tube 3. The open self-sealing tube 3 and the discharge inner tube 2 are in a closed state, which effectively ensures the air isolation effect. The heating module is used to prevent the molten salt in the self-sealing tube from solidifying and blocking, thereby ensuring that the molten salt can overflow and flow.

[0058] Furthermore, the angle formed by the molten pool 1 and the furnace 7 is in the range of 30° to 45° to ensure the flow of the molten salt in the molten pool 1. The cross-sectional radius of the upper surface of the self-sealing tube 3 is R0, and the cross-sectional radius of the discharge inner tube 2 is R1. R0 should be greater than R1 to ensure that the molten salt can flow out of the self-sealing tube 3 normally after accumulating to a certain amount in the self-sealing tube 3. The cross-sectional radius of the discharge outer tube 4 is R2, and R2 should be greater than R0 and R1.

[0059] In this embodiment, the heating module includes an induction heating coil 8 , which is located between the inner periphery of the discharge outer tube 4 and the outer peripheries of the self-sealing tube 3 and the discharge outer tube 4 .

[0060] Specifically, the molten salt can be heated by the induction heating coil 8 to ensure the fluidity of the molten salt in the self-sealing tube 3 and the discharge inner tube 2 to avoid solidification blockage.

[0061] In this embodiment, the air isolation valve 5 includes:

[0062] The fixed shaft 52 has two ends connected to the inner circumference of the discharge outer pipe 4 respectively;

[0063] Two valve leaves 51, the two valve leaves 51 are rotatably connected to the fixed shaft 52 through a first rotating sleeve 53 and a second rotating sleeve 54 respectively;

[0064] The rebound mechanism is connected to the fixed shaft 52 and the two valve leaves 51 , and can drive the two valve leaves 51 to close the discharge outer pipe 4 .

[0065] Specifically, the air isolation valve 5 is located at the bottom of the discharge outer pipe 4, and the two valve leaves 51 are driven by the rebound mechanism to close the discharge outer pipe 4, which is driven by the gravity of the molten salt. When the molten salt accumulates to a certain amount, the air isolation valve 5 opens and the molten salt falls into the transportation system. When the amount of molten salt is small, the air isolation valve 5 is closed to ensure the temperature of the system during the molten salt collection process. The gravity condition when the air isolation valve 5 is opened can be adjusted by replacing the rebound mechanism.

[0066] Furthermore, the transport system can be a water-cooled twin-screw conveyor, or a transport system composed of a water pool, a slag scoop machine, etc., and its function is to transport the solidified molten salt.

[0067] In this embodiment, the valve leaf 51 is semicircular and matches the inner circumference of the discharge outer pipe 4 .

[0068] In this embodiment, the rebound mechanism includes a torsion spring 55 . The torsion spring 55 is sleeved on the fixed shaft 52 . Two ends of the torsion spring 55 are respectively connected to the two valve leaves 51 .

[0069] Specifically, the torsion spring 55 is wound by a slender coil, and the cross-sectional diameter of the coil and the number of windings can be adjusted. The larger the diameter and the number of windings, the greater the weight required to open the air isolation valve 5.

[0070] In this embodiment, the furnace 7 further includes a lining 6 and a water-cooled wall.

[0071] In this embodiment, the cavity is provided with a manhole door 9 communicating with the outside.

[0072] Specifically, the cross section of the furnace 7 can be circular or rectangular, and the inner wall of the furnace 7 can be installed with a water-cooled wall or a lining 6, and the lining 6 can be made of castables, refractory bricks, etc. A manhole door 9 can be opened at the bottom of the furnace 7 for maintenance.

[0073] The present invention also provides a molten salt self-sealing discharge method of an alkali liquid incinerator, comprising:

[0074] Utilizing the air sealing system of the above-mentioned alkali liquor incinerator;

[0075] After the molten salt is gathered in the molten pool 1, it enters the self-sealing tube 3 through the discharge inner tube 2, so that the molten salt is accumulated in the self-sealing tube 3;

[0076] When the molten salt in the self-sealing tube 3 immerses the discharge inner tube 2, the discharge inner tube 2 is closed;

[0077] When the molten salt in the self-sealing tube 3 overflows, open the air isolation valve 5;

[0078] The air isolation valve 5 is closed after discharging the overflowing molten salt.

[0079] In this embodiment, it also includes:

[0080] A heating module is arranged between the inner periphery of the discharge outer tube 4 and the outer peripheries of the self-sealing tube 3 and the discharge outer tube 4;

[0081] The heating module is started according to the temperature of the self-sealing tube 3 to keep the molten salt fluid.

[0082] In this embodiment, the heating module includes an induction heating coil.

[0083] When the air sealing system of the molten salt of the alkali liquid incinerator of this embodiment is used, the use of the molten salt self-sealing discharge is taken as an example: the molten salt produced in the combustion chamber of the alkali liquid incinerator falls freely to the bottom of the furnace 7 and is preliminarily collected by the molten pool 1. Since the molten pool 1 has a certain slope, the molten salt freely flows into the self-sealing pipe 3 through the discharge inner pipe 2.

[0084] Since the discharge inner tube 2 extends into the bottom of the self-sealing tube 3, the molten salt will continue to gather in the self-sealing tube 3, and when the molten salt accumulates to a certain amount inside the self-sealing tube 3, it will automatically overflow the self-sealing tube 3. In this process, since the molten salt accumulates in the self-sealing tube 3, the inner and outer walls of the discharge inner tube 2 are filled with molten salt, which also blocks the passage of air into the incinerator through the discharge inner tube 2, achieving a self-sealing effect.

[0085] When the molten salt overflows the self-sealing tube 3, the molten salt falls freely to the surface of the air isolation valve 5 (the valve leaf 51). When the molten salt is less, the air isolation valve 5 is in a closed state due to the action of the rebound mechanism. When the amount of molten salt is large and the weight increases, the air isolation valve 5 will automatically open, allowing the molten salt to flow out of the incinerator and enter the transportation system.

[0086] In addition, when there are special circumstances such as the incinerator being stopped, the molten salt in the self-sealing tube 3 may solidify due to a long time. At this time, it can be heated by the electromagnetic induction heating coil 8 arranged between the discharge outer tube 4 and the discharge inner tube 2 to ensure that the solidified salt substance reaches the melting point again. The diameter of the electromagnetic induction heating coil 8 is larger than the diameter of the discharge inner tube 2 and smaller than the diameter of the discharge outer tube 4, and covers the bottom of the molten pool 1, the discharge inner tube 2 and the self-sealing tube 3 in the vertical length. The external power supply and water cooling device of the electromagnetic induction heating coil 8 are arranged outside the furnace. Of course, if the temperature of the molten pool is found to be low during normal operation, the electromagnetic heating coil 8 can be continuously turned on during the molten salt collection process. At this time, the power supply power can be adjusted according to the actual situation, and the appropriate heat can be selected to ensure the optimal fluidity of the molten salt.

[0087] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. An air sealing system for an alkali liquid incinerator, characterized in that: include: The molten pool is bucket-shaped and arranged at the bottom of the furnace to form a cavity with the bottom of the furnace; An outer discharge pipe, one end of which is located in the cavity at the bottom of the furnace and the other end of which can be exposed outside the furnace; An inner discharge pipe is arranged inside the molten pool, a collecting end is connected to the molten pool, and a releasing end is vertically inserted in the outer discharge pipe; A self-sealing tube, located inside the discharge outer tube, with one end being a closed structure and the other end being sleeved on the release end of the discharge inner tube in a gap; A heating module, disposed in the discharge outer pipe, for heating the self-sealing pipe; An air isolation valve is arranged at the exposed end of the discharge outer pipe; The molten salt in the alkali liquid incinerator enters the self-sealing tube through the discharge inner tube, and the air isolation valve is opened after the self-sealing tube is overflowed.

2. The air sealing system of the alkali liquid incinerator according to claim 1, characterized in that: The heating module includes an induction heating coil located between the inner periphery of the discharge outer tube and the outer peripheries of the self-sealing tube and the discharge outer tube.

3. The air sealing system of the alkali liquid incinerator according to claim 1, characterized in that: The air isolation valve comprises: A fixed shaft, both ends of which are respectively connected to the inner circumference of the discharge outer pipe; Two valve leaves, the two valve leaves are rotatably connected to the fixed shaft through a first rotating sleeve and a second rotating sleeve respectively; The rebound mechanism is connected to the fixed shaft and the two valve leaves, and can drive the two valve leaves to close the discharge outer pipe.

4. The air sealing system of the alkali liquid incinerator according to claim 3, characterized in that: The valve leaf is in a semicircular shape matching the inner circumference of the discharge outer pipe.

5. The air sealing system of the alkali liquid incinerator according to claim 3, characterized in that: The rebound mechanism comprises a torsion spring, which is sleeved on the fixed shaft, and two ends of the torsion spring are respectively connected to the two valve leaves.

6. The air sealing system of the alkali liquid incinerator according to claim 1, characterized in that: The furnace also includes a lining and a water-cooled wall.

7. The air sealing system of the alkali liquid incinerator according to claim 1, characterized in that: The cavity is provided with a manhole door communicating with the outside.

8. A self-sealing method for discharging molten salt from an alkali liquor incinerator, characterized in that: include: Utilize the air sealing system of the alkali liquid incinerator according to any one of claims 1 to 7; After the molten salt is gathered in the molten pool, it enters the self-sealing tube through the discharge inner tube, so that the molten salt accumulates in the self-sealing tube; When the molten salt in the self-sealing tube immerses the discharge inner tube, the discharge inner tube is closed; When the molten salt in the self-sealing tube overflows, open the air isolation valve; The air isolation valve is closed after the overflowing molten salt is discharged.

9. The molten salt self-sealing discharge method of the alkali liquid incinerator according to claim 8, characterized in that: Also includes: A heating module is arranged between the inner periphery of the discharge outer tube and the outer peripheries of the self-sealing tube and the discharge outer tube; The heating module is started according to the temperature of the self-sealing tube to keep the molten salt fluid.

10. The molten salt self-sealing discharge method of the alkali liquid incinerator according to claim 9, characterized in that: The heating module includes an induction heating coil.

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